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Trackers› Clinical trials› California
Clinical trial register · United States · industry-sponsored

Clinical Trials in California, 2026

Every industry-sponsored study on the ClinicalTrials.gov registry that lists a US site and is open, about to open, active-but-closed, or enrolling by invitation. This deliberately excludes academic and other non-industry sponsors — the full US registry across all sponsors runs to over 22,000 recruiting studies alone.

Download CSV
Source: ClinicalTrials.gov. Complete coverage of the industry-sponsored slice — all 9144 matching records are in this view (non-industry sponsors are out of scope by design, not truncated). Synced 16 Oct 2026, 03:16 UTC
9144
Studies in scope
industry-sponsored, all four open statuses
4957
Recruiting now
open to new participants
2196
Lead sponsors
across recruiting studies
Top states
California 26 Florida 26 Georgia 18 Illinois 17 Arizona 15
Narrow the registerReset
Recruitment status
Phase
Lead sponsor
AstraZeneca231 Eli Lilly and Company152 AbbVie145 Merck Sharp & Dohme LLC128 Pfizer117 Clear sponsor filter
State
California26 Florida26 Georgia18 Illinois17 Arizona15
All 34 states
Target enrolment
to

Trials with a site in California

26 of 9144 studies
Download
Status
Study
Lead sponsor
Phase
Enrol
US states
Start
Recruiting
Boston Scientific Corporation
Not applicable
66
California, Florida, Massachusetts, New York, Ohio, Pennsylvania, Washington, West Virginia
2026-10
Recruiting
Boston Scientific Corporation
Not applicable
108
California, Florida, Illinois, Maryland, Minnesota, New York, Texas, West Virginia
2026-04-14
Active, closed
Boston Scientific Corporation
Not applicable
699
Arkansas, California, Georgia, Idaho, New York, Ohio, Pennsylvania, Texas
2025-11-07
Recruiting
Boston Scientific Corporation
Not applicable
850
Alabama, Arizona, Arkansas, California, District of Columbia, Florida, Georgia, Idaho
2025-10-22
Recruiting
Boston Scientific Corporation
Not applicable
1,616
Arkansas, California, Colorado, Florida, Georgia, Illinois, Massachusetts, Michigan
2025-08-21
Active, closed
Boston Scientific Corporation
Not applicable
376
Alabama, Arkansas, California, Colorado, Florida, Georgia, Idaho, Illinois
2025-06-03
Recruiting
Intracept Minimally-invasive PROcedure for VErtebrogenic Back Pain
NCT06827262Chronic Low-back Pain, Vertebrogenic Pain Syndrome
Boston Scientific Corporation
Observational
1,500
Arizona, California, Connecticut, District of Columbia, Florida, Georgia, Idaho, Illinois
2025-03-26
Active, closed
Boston Scientific Corporation
Not applicable
230
California, Florida, Georgia, Illinois, Kansas, New York, Ohio, Pennsylvania
2024-10-30
Active, closed
Boston Scientific Corporation
Phase 3
20
Arizona, California, Georgia, Michigan, New York, Ohio, Pennsylvania, Rhode Island
2024-10-07
Active, closed
SIMPLAAFY Clinical Trial
NCT06521463Atrial Fibrillation, Stroke, Bleeding
Boston Scientific Corporation
Not applicable
1,857
Alabama, Arizona, Arkansas, California, Colorado, Connecticut, District of Columbia, Florida
2024-10-01
Active, closed
ADVENT Post Approval Study
NCT06431815Paroxysmal Atrial Fibrillation
Boston Scientific Corporation
Observational
228
Alabama, Arizona, California, District of Columbia, Florida, Georgia, Louisiana, Massachusetts
2024-09-25
Active, closed
Boston Scientific Corporation
Not applicable
484
Alabama, Arizona, Arkansas, California, Florida, Georgia, Illinois, Indiana
2023-12-28
Active, closed
TheraSphere With Durvalumab and Tremelimumab for HCC
NCT05063565Hepatocellular Carcinoma
Boston Scientific Corporation
Phase 2
100
California, District of Columbia, Florida, Illinois, Louisiana, Minnesota, Missouri, New York
2023-11-03
Recruiting
Boston Scientific Corporation
Phase 1
36
Alabama, California, Florida, Illinois, Maryland, Missouri, New York, Texas
2022-07-30
By invitation
IT Matters: The Erectile Restoration Registry
NCT04200937Erectile Dysfunction
Boston Scientific Corporation
Observational
450
California, Florida, Illinois, Indiana, Louisiana, Missouri, North Carolina, Ohio
2021-08-05
Active, closed
Boston Scientific Corporation
Phase 4
544
Alabama, California, Delaware, Georgia, Indiana, Kentucky, Maryland, Massachusetts
2021-08-02
Active, closed
Boston Scientific Corporation
Phase 3
600
Alabama, Arizona, California, Colorado, Florida, Georgia, Illinois, Kansas
2021-05-11
Recruiting
Boston Scientific Corporation
Observational
5,000
Arkansas, California, Connecticut, Delaware, District of Columbia, Florida, Georgia, Illinois
2021-03-29
Active, closed
Boston Scientific Corporation
Not applicable
177
California, Colorado, Florida, Illinois, Indiana, Louisiana, New York, North Carolina
2021-02-10
Active, closed
CHAMPION-AF Clinical Trial
NCT04394546Atrial Fibrillation, Stroke, Bleeding
DrugsNon-Vitamin K Anticoagulant·NOAC
Boston Scientific Corporation
Not applicable
3,000
Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia
2020-10-15
Active, closed
Boston Scientific Corporation
Not applicable
166
California, Florida, Georgia, Idaho, Illinois, Kansas, Massachusetts, Michigan
2020-01-30
Active, closed
Boston Scientific Corporation
Not applicable
1,948
Alabama, Arizona, Arkansas, California, District of Columbia, Florida, Georgia, Illinois
2019-06-10
Recruiting
Deep Brain Stimulation (DBS) Retrospective Outcomes Study
NCT03664609Parkinson Disease, Essential Tremor, Dystonia
Boston Scientific Corporation
Observational
5,000
Arizona, California, Florida, Idaho, New York, North Carolina, Pennsylvania, Washington
2019-03-12
Recruiting
Boston Scientific Corporation
Observational
1,500
California, Colorado, Florida, Idaho, Illinois, Indiana, Massachusetts, Missouri
2014-03-04
Recruiting
Boston Scientific Corporation
Observational
4,800
Arizona, California, Colorado, Florida, Georgia, Illinois, Indiana, Kansas
2012-11-19
Recruiting
Patient Retrospective Outcomes (PRO)
NCT01550575Chronic Pain
Boston Scientific Corporation
Observational
15,000
Arizona, California, Colorado, Connecticut, Florida, Georgia, Hawaii, Idaho
2012-04-03
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Cite this view

Priya Life Science (2026). Clinical trial register: industry-sponsored studies with a US investigative site, filtered. Derived from ClinicalTrials.gov. Retrieved 16 October 2026. https://priyalifescience.com/clinical-trials-usa/state/california

Query this register directly
GET /api/trials?country=usa&status=recruiting&format=json Try it now →

About this register

This register is built from ClinicalTrials.gov, the trial registry run by the U.S. National Library of Medicine. It includes every industry-sponsored study on the registry that lists at least one investigative site in the US and is recruiting, not yet recruiting, active but no longer recruiting, or enrolling by invitation: 9,144 studies in total at the last sync on 16 Oct 2026, 03:16 UTC. Academic and other non-industry sponsors are out of scope by design. The full list can be downloaded as CSV or queried as JSON through the register API.

This page shows the 26 of those studies with a site in California that also match the filters currently applied.

How many clinical trials are recruiting in California?

11 of the 26 studies on this page are recruiting new participants as of the 16 Oct 2026, 03:16 UTC sync. A further 0 have not yet opened recruitment, 14 are active but closed to new participants, and 1 are enrolling by invitation only. Eligibility for any study is decided by its study team.

Summary by phase

Studies by phase (California), 26 studies
PhaseStudiesRecruitingShare
Not applicable13450%
Observational8630.8%
Phase 3207.7%
Phase 1113.8%
Phase 2103.8%
Phase 4103.8%

Most active sponsors

Lead sponsors with the most studies (California)
Lead sponsorStudiesRecruiting
Boston Scientific Corporation2611
Listing here is informational and not medical advice; eligibility is determined by each study team. Compare pay for the teams running these studies in the US Pharma Salary Guide, see who's behind them in the US Company Directory, or track approvals on the FDA Approvals Tracker. For Irish, UK and EU sites, see the Ireland, UK and EU registers.